A simple serial connection question

[Marco >.<]

Dear all,
This is my first time to build a program to talk with external device. I will say the question is very simple for all of you, but it takes me a few days already.
I need to make a program to talk with the "brainmaster" system. It uses RS-232 port. The Start ADC Module code is "G B603 Cr". I just follow what the instruction says. I have selected different port. Could anyone please tell me what wrong of my program?

[Process_Systems]

Hello Marco
I don't know the specific module you are using, but from th doc file you supplied, and a quick look at you VISA code, I would suggest that the command you send should be G B603,followed by the carraige return character, not a single string of G B603 Cr, as you have done. Basically, the ascii characters Cr are not the same as the code for a carraige return. Also, I am not sure why you send the line feed character at the start of your string???

HOpe this helps

Dave

[Marco >.<]

Thanks